Talvez deva tentar algumas variações de ortografia:
spectrum approximation » term approximation (Expandir a busca), medium approximation (Expandir a busca)
elasticity compressive » elasticas compressivas (Expandir a busca)
winding optimization » mining optimization (Expandir a busca), building optimization (Expandir a busca), timing optimization (Expandir a busca)
compressive winding » compressive sensing (Expandir a busca), compressive loading (Expandir a busca), compressive sampling (Expandir a busca)
algorithms and » algorithms _ (Expandir a busca)
and elasticity » and plasticity (Expandir a busca), and electricity (Expandir a busca), of elasticity (Expandir a busca)
routine and » routines and (Expandir a busca), routing and (Expandir a busca), routine care (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Caso esteja tentando utilizar os operadores booleanos, deve escrevê-los em Letras MAIÚSCULAS: routine AND spectrum approximation algorithms AND elasticity compressive winding optimization~.
• Adicionar um caractere curinga pode recuperar variações da palavra buscada: routine and spectrum approximation algorithms and elasticity compressive winding optimization*.